FolderPlayer Music PlayerFolderPlayer offers a multi-functional media player with capabilities to play mp3 files along with all other formats supported by the device

JLayerMEJLayerME is an open source MP3 decoder library for J2ME/CDC/CLDC platform.
JLayerME project is split in two branches. JLayerME-CDC for CDC compliant devices and JLayerME-CLDC for CLDC compliant devices (such as mobiles). JLayerME-CLDC includes a MIDlet MP3 player

Duomi 3.6.0.00Duomi 3.6.0.00 - Duomi Chinese Java Music Player
For Nokia X2-01 S40 Series 320 x 240 J2ME
Support
MP3/WMA/AAC/MID/AMR / M4A/ogg/flac/mp4, format (Or so I think. :/)
http://duomi.com/bbs/thread.shtml?aid=230
As you can see here and from the screenshots this is the Chinese version I think...or so that's what Google said when I tried translating it